A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is___________________?
Correct answer: C. 1.24
- A. 0.54
- B. 1.04
- C. 1.24
- D. 1.94
Explanation
For equal drug volume, the initial dissolution rate is proportional to exposed surface area. A cube has about 1.24 times the surface area of an equal-volume sphere, so its initial dissolution rate has the same ratio.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Mass Transfer Operations
669 free Mass Transfer Operations MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Mass Transfer Operations questions
The operating cost of a distillation column at minimum reflux ratio is____________________?
___________________ extractor uses centrifugal force for separating the two phases?
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
With increase in temperature, the mutual solubility of two liquids___________________?
The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?
Can the efficiency of a plate in the distillation tower be greater than 100% ?